366 True and Hunkel, The Poisonous Effect Exerled etc. 



cule; no difFerence is, however, to be detected between the effect- 

 iveness of the ortho and the meta derivatives. 



Orcinol may be regarded as resorcinol, C6H4 (OH) (OH) 

 = 3:5, one hydrogen atom replaced by a methyl group (CH3) ; 

 or as phloroglucin, CeHs (OH) (OH) (OH) = 1:3:5, in which 

 one hydroxyl group has been displaced by a methyl group. 



Orcinol, CeH^ (CHs) (OH) (OH) = 1:3:5. 

 Table XXIX. 



(?)• 



The addition of the methyl group (CH3) increases appreciably 

 the toxic value of the Compound, as we have seen in the cresols. 

 Comparing orcinol with resorcinol, we see that here again we have 

 .an increase of toxic activity, resorcinol 1/200 as against orcinol, 

 1/400. It might, however, be possible to i-egard orcinol as meta- 

 cresol in which one H atom is replaced by an OH group. A 

 comparison ot the toxic value of meta-cresol (1/800) with that 

 of orcinol (1'400) might point to the conclusion that in this case 

 the addition of the OH group has diminished the toxic efFect. 

 Compared with phloroglucin, we see an increase of toxic action, 

 this increase being in the ratio already seen when orcin is com- 

 pared with resorcinol. 



In the tables immediately following, we see the efFect on 

 plants resulting from the introduction into the molecule of nitrogen- 

 containing radicles. 



Ortho-nitrophenol, Ce H4 (OH) (NO2) = 1:2. 

 Table XXX. 



Begun Jan. 30, 3 : 15 P. M. 

 Gram mol. per liter. Length Jan. 31. Length Feh. 2. 



10 : 50 P. M. 4 : 00 P. M. Condition. 



1/6400 



1/12800 



1/25600 



